meta-ibm: romulus: new YAML dependency scheme

A prior patch added a new recipe romulus-yaml-config to provide all the
YAML configuration for Romulus systems.  This patch switches the layer
to that recipe by setting EXTRA_OECONF and DEPENDS as appropriate in the
required bbappends.

With this switch, a number of recipes and their provided YAML are now
dead metadata, so remove those.

Change-Id: If5e480eb1477d6847051a3fa04c889668a86158e
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-romulus/recipes-phosphor/ipmi/openpower-ipmi-oem_%.bbappend b/meta-romulus/recipes-phosphor/ipmi/openpower-ipmi-oem_%.bbappend
new file mode 100644
index 0000000..73c50cf
--- /dev/null
+++ b/meta-romulus/recipes-phosphor/ipmi/openpower-ipmi-oem_%.bbappend
@@ -0,0 +1,5 @@
+DEPENDS_append_romulus = " romulus-yaml-config"
+
+EXTRA_OECONF_romulus = " \
+    INVSENSOR_YAML_GEN=${STAGING_DIR_HOST}${datadir}/romulus-yaml-config/ipmi-inventory-sensors.yaml \
+    "